Abstract
We studied the relaxation of electroluminescence roll-off characteristics by changing the dopant concentration and thickness of the emitting layer in organic blue electrophosphorescence diodes composed of a 2,6-dicarbazolo-1,5-pyridine host doped with iridium(III)-bis[(4,6-di-fluorophenyl)-pyridinato-N,C2]picolinate. Analyzing the roll-off characteristics using the theoretical models of triplet–triplet annihilation and triplet–polaron annihilation (TPA), we found that the roll-off characteristics of these devices were determined primarily by TPA.
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